If it helps, the iTerrarium above has already found a home, but I’m working on an improved model that includes opportunities for turning it into a vivarium as well. The idea, with proper locks, is for it to be usable for tree and arrow poison frogs, but it would probably work equally well for geckos, skinks, and other small reptiles and amphibians. Thank you very much for the writeup, and I hope to give you a surprise when Mark II is ready.